However those posts are quite old, and I heard that there is now a package that can import LC-QqQ (aka MRM) data in R. Unfortunately I cannot find it. Any hint would be highly welcome.

My current workaround is to use Proteowizard to convert my .d files to .txt files, for which I then wrote a very simple parser in R. But this is obviously less nice than using a well defined file format like .mzML.